$(window).resize(function () {
screenRespond();
});screenRespond();function screenRespond(){var screenWidth = $(window).width();if(screenWidth <= 1800){
$("body").attr("class", "w1800");
}if(screenWidth <= 1400){
$("body").attr("class", "w1400");
}if(screenWidth > 1800){
$("body").attr("class", "");
}
}
